import java.util.Scanner;
class TreeNode {
    char val;
    TreeNode left;
    TreeNode right;

    TreeNode() {}

    TreeNode(char val) {
        this.val = val;
    }
}
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextLine()) { // 注意 while 处理多个 case
            String str = in.nextLine();
            TreeNode treeNode = create(str);
            order(treeNode);
        }
    }
    public static int i =0;
    public static TreeNode create(String str){
        TreeNode root = null;
        if(str.charAt(i) != '#'){
            root = new TreeNode(str.charAt(i));
            i++;
            root.left = create(str);
            root.right = create(str);
        }else{
            i++;
        }
        return root;
    }


    public static void order(TreeNode root){
        if(root == null ) return ;

        order(root.left);
        System.out.print(root.val+" ");
        order(root.right);
    }
}